1968 AC equipped confusion

Did 1968 Barracudas with factory air use some kind of a heater valve mounted underhood somewhere? I seem to recall something like that rolling around in the trunk when I got the car. But it was a solid chunk of rust so I just tossed it out.
My car was a factory AC car, but all the underhood stuff was MIA by the time I got the car.
The AC heater box was so trashed that I just threw it out (broken, warped, and melted).
I have no desire to restore the AC to the car, but I seem to be stuck with using the AC heater box just to have heat unless I want to track down a 68 heat only dash bezel and controls.
But now, by a fluke, I found 2 correct AC/heat boxes at a garage sale of all places! Between the two, I can make up one nice box and have some heat in the car at last. And all for just 25 bucks!
But I am wondering about that heater valve? I have searched online for 1968 cuda AC equipped engine compartments and don't see one in the pics, but I am wondering as I found a " 1968 Barracuda heater valve " listed on ebay,
About all cars use a valve in the engine coolant line running to the heater core in the under dash box to modulate coolant flow to the heater core to raise or lower heater temperature output.
The valve in the coolant line of my non ac 68 Barracuda is cable controlled.
I probably still have it around here somewhere. I will look around.
More modern valves have a vacuum line attachment to completely close the valve to stop all coolant flow when the Max AC button is pushed.